When can I start icing my chest with an ice pack after breast implant surgery?

Best to run these types of questions by your plastic surgeon who knows your situation best and is ultimately responsible for your care. Regardless, patients should be very careful about applying cold or heat to recently operated upon areas; these areas will likely be numb and can potentially be damaged by excessive cold/heat that the patient does not sense . Therefore, in my practice, I ask patients not to apply either cold packs or heating pads directly upon surgical sites. Again, your plastic surgeon will be your best resource. Best wishes; hopefully, you will be very pleased with the long-term outcome of the procedure performed.

I do not recommend icing, ever.  After
breast implant surgery, I advise the patients to take one week off from work.
At that point we take out their stitches and teach them the implant
massage technique. We suggest 5 times per day with the massage and no bra
for one month. The patients may return to work, but may not engage in any
strenuous activity. At one month, the patients start to wear a of cup bra
with no underwire and can start low impact cardio. At two months they can
wear an underwire bra and engage in more strenuous physical activity.
Breast massage continues forever, although only once per day.